Why do guys act distant when they give off signs of attraction?

Anonymous
My guy friend knew I liked him but he said he wasn't interested in anyone although he had acted interested.

After he knew I liked him, he and I for some reason talked a lot more than ever. He would initiate conversation, almost always try to find me in person to talk to, etc.

Recently, he looked at me multiple times when my back was to him and turned away the one time my friend caught him. He notice my earrings when we were having lunch (he initiated me hanging out after I called him out that we were talking online too much). He acts jealous sometimes when I talk about guys/talk to other guys. The last time we saw each other, he came to find me to hugged me goodbye (and dropped an arm when two of my friends were looking at him) and wished me a Merry Christmas and safe travels back home, smiling.

We haven't really talked much lately, but at the same time, I may just be spoiled at the fact we talked so much. I just find it odd I've had to initiate lately, and I've noticed the one time we did talk, he responded quickly at times, and then showed off and bragged about himself.

Guys, what's going on? I mean, the only explanation I know is he's busy, but I'm just ... confused.
Why do guys act distant when they give off signs of attraction?
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